S3.1 The periodic table: Classification of elements Quiz
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5 questions, one answer each
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1. Which pair shows a decrease in first ionisation energy from the first element to the second?
- A. C → N
- B. Mg → Al
- C. Na → Mg
- D. Si → P
2. How many unpaired electrons does Mn²⁺ have?
- A. 2
- B. 3
- C. 5
- D. 7
3. Which ion forms colourless aqueous complexes?
- A. Cu²⁺
- B. Fe³⁺
- C. Co²⁺
- D. Sc³⁺
4. A complex absorbs light at 450 nm (blue). What colour is it?
- A. Orange
- B. Blue
- C. Green
- D. Violet
5. Why do the successive ionisation energies of manganese allow many oxidation states?
- A. There is a large jump after the second
- B. They are close in value with no large jump until the eighth
- C. They decrease after the fourth
- D. They are all equal